Scientist Eric Stroud spent years as a pharmaceutical chemist. But, after an unpleasant cruise the Bermuda, he gave that up in order to pursue research in ways to protect humans from sharks. But his work has also shifted to ways to protect sharks from humans. And he's made fascinating findings.

An American chemist says he's found a substance several, in fact, that can repel some of the most fearsome predators in the ocean, and he wants to use his discovery to protect them. Reporter Ari Daniel Shapiro of our partner program NOVA has the story.

An American chemist says he's found a substance several, in fact, that can repel some of the most fearsome predators in the ocean, and he wants to use his discovery to protect them. Reporter Ari Daniel Shapiro of our partner program NOVA has the story.

Scientist Eric Stroud spent years as a pharmaceutical chemist. But, after an unpleasant cruise the Bermuda, he gave that up in order to pursue research in ways to protect humans from sharks. But his work has also shifted to ways to protect sharks from humans. And he's made fascinating findings.